1 #ifndef _X86_64_PGALLOC_H
2 #define _X86_64_PGALLOC_H
4 #include <asm/fixmap.h>
6 #include <linux/threads.h>
9 #define pmd_populate_kernel(mm, pmd, pte) \
10 set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
11 #define pud_populate(mm, pud, pmd) \
12 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)))
13 #define pgd_populate(mm, pgd, pud) \
14 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)))
16 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
18 set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
21 static inline pmd_t *get_pmd(void)
23 return (pmd_t *)get_zeroed_page(GFP_KERNEL);
26 static inline void pmd_free(pmd_t *pmd)
28 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
29 free_page((unsigned long)pmd);
32 static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
34 return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
37 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
39 return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
42 static inline void pud_free (pud_t *pud)
44 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
45 free_page((unsigned long)pud);
48 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
51 pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
55 * Copy kernel pointers in from init.
56 * Could keep a freelist or slab cache of those because the kernel
59 boundary = pgd_index(__PAGE_OFFSET);
60 memset(pgd, 0, boundary * sizeof(pgd_t));
61 memcpy(pgd + boundary,
62 init_level4_pgt + boundary,
63 (PTRS_PER_PGD - boundary) * sizeof(pgd_t));
67 static inline void pgd_free(pgd_t *pgd)
69 BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
70 free_page((unsigned long)pgd);
73 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
75 return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
78 static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
80 void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
83 return virt_to_page(p);
86 /* Should really implement gc for free page table pages. This could be
87 done with a reference count in struct page. */
89 static inline void pte_free_kernel(pte_t *pte)
91 BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
92 free_page((unsigned long)pte);
95 static inline void pte_free(struct page *pte)
100 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
102 #define __pmd_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
103 #define __pud_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
105 #endif /* _X86_64_PGALLOC_H */